I put a scope on my BFR. In the research I did on scopes, for 460 and 500, you want to stick with either a Burris or Leupold. I read several stories of other brands getting shredded pretty quickly. One guy tore up 2 or 3 Nikons(which were covered under warranty), then switched to either a Burris or Leopold, and never had any problems after that. Another trick I saw was to use three scope rings if possible.
I put a Leupold M8 on mine. Here's a pic. Note the triple scope ring mount.